// function test(a, b, c) {
//   console.log(a, b, c);
// }
// test.call('', 1, 2, 3);
// test.apply('', [1, 2, 3]);
// test.bind('', 1, 2, 3)();

function Compute() {
  this.plus = function(a, b) { console.log(a + b) };
  this.minus = function(a, b) { console.log(a - b) };
}

function FullCompute() {
  Compute.call(this);
  this.mul = function(a, b) { console.log(a * b) };
  this.div = function(a, b) { console.log(a / b) };
}

let compute = new FullCompute()
compute.plus(1, 2)  